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Originally posted by zatara
Now here comes the question...
First of all.....is it possible to calculate the energy in the universe and how should you go about that?
And second.....Is it possible to calculate the mass of the firecracker that caused the big bang? (assuming there was a big bang ofcourse)
Do not ask me why I should want to know that.....i am just curious...
Gravity or the attraction of things for each other, but did it really blow or is illusion.
Originally posted by zeta55
I cannot answer your question. I have a question of my own concerning the Big-Bang.
We are told that the entire Universe was condensed into an infinitely small speck that exploded and became the entire Universe.
My question is this, to anyone that can help me understand: How could all the matter of the Universe be compressed down to the size of an atom?
I could more easily understand if the Universe was compressed to the size of a Galaxy, then exploded, creating everything that is.
I just can't see how it could all be compressed to the size of an atom.
Also, if it all started with a bang, should there not be a center of the Universe, where the explosion originated from?
Like dropping a stone into a mass of water, there is always a center, with the waves radiating outward.
Thanks ahead of time for any help.
This is the things that can make people crazy.
Originally posted by 5MaveN5
Where would a singularity come from anyway?
Thanks for the thoughts.
The reason that it is impossible is because we don't know and apparently can't know how big the universe is. We can only see things that are as far away as the the speed of light times the age of the universe. This is known as the observable universe. The universe is ~14 billion years old, so we can only see light that originates 14 billion light years away, or less. We can't see anything farther away than that because the light has not had time to reach us.
The bottom line is that we can't - even in principal - determine the total energy of the universe because we can't see beyond the boundry that lies at the age of the universe times the speed of light.
The universe is about 13.7 billion years old. Light reaching us from the earliest known galaxies has been travelling, therefore, for more than 13 billion years. So one might assume that the radius of the universe is 13.7 billion light-years and that the whole shebang is double that, or 27.4 billion light-years wide.
But the universe has been expanding ever since the beginning of time, when theorists believe it all sprang forth from an infinitely dense point in a Big Bang.
"All the distance covered by the light in the early universe gets increased by the expansion of the universe," explains Neil Cornish, an astrophysicist at Montana State University. "Think of it like compound interest."
Need a visual? Imagine the universe just a million years after it was born, Cornish suggests. A batch of light travels for a year, covering one light-year. "At that time, the universe was about 1,000 times smaller than it is today," he said. "Thus, that one light-year has now stretched to become 1,000 light-years."
Is the Universe really infinite or just really big?
We have observations that say that the radius of curvature of the Universe is bigger than 70 billion light years. But the observations allow for either a positive or negative curvature, and this range includes the flat Universe with infinite radius of curvature. The negatively curved space is also infinite in volume even though it is curved. So we know empirically that the volume of the Universe is more than 20 times bigger than volume of the observable Universe. Since we can only look at small piece of an object that has a large radius of curvature, it looks flat. The simplest mathematical model for computing the observed properties of the Universe is then flat Euclidean space. This model is infinite, but what we know about the Universe is that it is really big.